There are many things to consider when quitting your job, but for most of us, proving “just cause” to a governing body isn’t one of them. Just cause can be a real problem for professional soccer players who want to change teams; they can be subject to significant financial and disciplinary penalties if their previous employer can prove unfair treatment. U-M Professor of Sports Management Stefan Szymanski explains the European Court of Justice’s recent step toward dismantling this system for The Conversation.